1 . _____ (视觉信息)，such as photos and illustrations, can support reading and help you identify the theme and content of a text. (根据汉语提示完成句子)

2 . From the food blog, I've known what_____(起源) Gong Bao Chicken is, which is an interesting story. (根据汉语提示完成句子)

3 . Since_______ (免疫系统) is our main defense against disease, 1 suggest you take regular exercise to strengthen it. (根据汉语提示完成句子)

4 . During the war Frank used to make _______ _________ （零配件)for aeroplanes. （根据汉语意思填空）